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Title:
Density and Temperature Structure of TMC-1C from 450 and 850 Micron Maps
Authors:
Schnee, S.; Goodman, A.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; ), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; )
Publication:
The Astrophysical Journal, Volume 624, Issue 1, pp. 254-266. (ApJ Homepage)
Publication Date:
05/2005
Origin:
UCP
ApJ Keywords:
ISM: Dust, Extinction, Stars: Formation, Submillimeter
DOI:
10.1086/429156
Bibliographic Code:
2005ApJ...624..254S

Abstract

We have mapped the central 10'×10' of the dense core TMC-1C at 450 and 850 μm using SCUBA on the James Clerk Maxwell Telescope. The unusually high quality of the 450 μm map allows us to make a detailed analysis of the temperature and column density profiles of the core. We find that the dust temperature at the center of TMC-1C is ~7 K, rising to ~11 K at the edges. We discuss the possibility and effects of a variable emissivity spectral index on the derived mass profile. The low dust temperature of TMC-1C results in a high derived mass for the core, significantly larger than the virial mass estimated from the line width of the N2H+ (1-0) transition. This result is valid within a wide range of dust properties and ellipticities of the core. The N2H+ (1-0) spectra, taken with the IRAM 30 m telescope, show signs of self-absorption, which provide evidence of subsonic infall motions. The derived density profile and infall velocity are compared to the predictions of several popular star formation models, and the Bonnor-Ebert model is the best-fit analytic model.
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